+

WO1997047161A2 - Appareil de chauffage a micro-ondes - Google Patents

Appareil de chauffage a micro-ondes Download PDF

Info

Publication number
WO1997047161A2
WO1997047161A2 PCT/JP1997/001822 JP9701822W WO9747161A2 WO 1997047161 A2 WO1997047161 A2 WO 1997047161A2 JP 9701822 W JP9701822 W JP 9701822W WO 9747161 A2 WO9747161 A2 WO 9747161A2
Authority
WO
WIPO (PCT)
Prior art keywords
heating
wave guide
microwave
metal plate
opening
Prior art date
Application number
PCT/JP1997/001822
Other languages
English (en)
Other versions
WO1997047161A3 (fr
Inventor
Susumu Idomoto
Kazuho Sakamoto
Hirofumi Yoshimura
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP8139884A external-priority patent/JPH09320756A/ja
Priority claimed from JP01363097A external-priority patent/JP3855337B2/ja
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to US09/194,739 priority Critical patent/US6114677A/en
Publication of WO1997047161A2 publication Critical patent/WO1997047161A2/fr
Publication of WO1997047161A3 publication Critical patent/WO1997047161A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors
    • H05B6/6464—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors using weight sensors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H05B6/688—Circuits for monitoring or control for thawing
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • H05B6/705—Feed lines using microwave tuning
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • H05B6/707—Feed lines using waveguides
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/74—Mode transformers or mode stirrers
    • H05B6/745—Rotatable stirrers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Definitions

  • the present invention relates to a microwave heating apparatus for heating foodstuff, specifically a constitution for heating foodstuff efficiently and evenly.
  • the prior art microwave heating apparatus comprises a heating cavity 22 for heating/cooking a heating object 21, a magnetron 23 for irradiating microwave into said heating cavity 22, a wave guide 24 for coupling the heating cavity 22 and the magnetron 23, a dielectric axle 25 being inserted in the wave guide 24, a metal reflector 26 held by the dielectric axle 25 for adjusting the impedance comprised of a reflecting surface 26a and a metal stub 26b provided at the circumference of the reflecting surface, and a control means 27 for controlling the positioning of metal stub 26b by revolution of the metal reflector 26, wherein a means to discern by way of detecting the temperature of heating object 21 a transition point at which physical properties of a heating object 21 change during microwave heating procedure is provided, and the impedance matching of microwave within heating cavity 22 is varied by revolving the metal reflector 26 before and after the transition point in order to create a heating condition that is optimum for each of various stages of physical properties of
  • the apparatus is further provided with a constitution so as it can also thaw a frozen heating object 21 by an even heating in a state under which the microwave hardly hit direct on the heating object; such state being created by revolution of metal reflector 26, while keep supplying the electric power without interruption to a microwave generating means in order to maintain the operation at a weak output level.
  • the heating efficiency is improved as compared with a one having a heating cavity 22 of a same shape and a same power supply system of no impedance adjustment.
  • the impedance adjustment means the greatest output of magnetron 23 is being delivered to heating cavity 22, and not all of the output is absorbed into heating object 21.
  • a certain impedance adjusted to a heating object 21 is not always a one which results in an even heating; therefore, in some occasions an efficient but uneven heating may occur depending on a category of heating object 21.
  • a microwave heating apparatus comprises a magnetron for irradiating microwave, a wave guide for guiding the microwave generated by said magnetron to heating cavity, an opening for delivering the microwave travelled through said wave guide into the heating cavity sidewise, and a metal plate provided inside said wave guide for regulating the direction of microwave; wherein said magnetron is disposed on the top of wave guide, while the bottom surface of said wave guide is inclined towards the bottom part of said opening and the metal plate is disposed with a clearance to and in parallel with the bottom surface of wave guide.
  • the microwave irradiated from magnetron are conveyed through a gap formed by the wave guide and the metal plate to the opening.
  • the microwave is conveyed to the opening with a suppressed dispersion, it irradiates a heating object efficiently. The efficiency of heating is thus improved.
  • the metal plate disposed in wave guide is supported revolvable with an axle and is provided with a revolving means to shift the direction of plate, so that the angle of said metal plate in wave guide against the bottom surface of wave guide is changed in accordance with detection results delivered from a sensor for detecting weight, shape, category, etc. of a heating object or by selection of a cooking menu.
  • the quantity of microwave irradiation from the bottom portion of opening of wave guide beneath the metal plate and that from the portion of opening closer to magnetron may be shifted, which makes it possible to evenly heat various heating objects.
  • a driving means for driving the metal plate disposed within wave guide can revolve the metal plate to create a first state under which said metal plate within wave guide is in parallel with the bottom surface of wave guide up to a second state under which the metal plate is perpendicular to the bottom of heating cavity, based on detection results delivered from a sensor for detecting weight, shape, category, etc. of a heating object or by selection of a cooking menu.
  • two types of heating patterns are implementable; a pattern of concentrated microwave irradiation from the opening which pattern is created by positioning the metal plate in parallel with the bottom surface of wave guide, and a pattern of splitted microwave irradiation from openings splitted by the metal plate positioned perpendicular to the bottom of heating cavity.
  • This enables to select a suitable heating pattern according to detection results delivered from the heating object sensor and by selection of a cooking menu key.
  • a driving means for driving the metal plate in wave guide enables for the metal plate to take any angle against the bottom surface of wave guide according to detection results delivered from a sensor for detecting the weight, shape, category, etc. of heating object or by selection of a cooking menu key.
  • a stirrer is provided for stiring the microwave. This constitution helps improve the uneven heating during thawing of a frozen heating object, by stirring the microwaves left unabsorbed by a heating object.
  • a conical shape is formed protruding towards outside with a spherical shape provided at the centre protruding towards inside.
  • This constitution helps improve the uneven heating and the heating efficiency by collecting the microwaves left unabsorbed by a heating object to the centre of conical shape and then reflecting them with the spherical shape to evenly irradiate the heating object.
  • Fig.l is a cross-sectional front view of a microwave heating apparatus according to an embodiment of the present invention.
  • Fig.2 is a perspective view showing a key part of a microwave heating apparatus according to other embodiment of the present invention.
  • Fig.3 is a front view of a key portion of the microwave heating apparatus of Fig.2.
  • Fig.4 is a conceptual illustration showing the distribution pattern of electric fields in the microwave heating apparatus of Fig.2.
  • Fig.5(a) is a characteristics chart showing the temperature difference in objects of heating in relation to positioning of metal plate in the microwave heating apparatus.
  • Fig.5(b) is a characteristics chart showing the heating time for objects of heating in relation to positioning of metal plate in the microwave heating apparatus.
  • Fig.6 is a cross-sectional front view of a microwave heating apparatus according to a still other embodiment of the present invention.
  • Fig.7 is a cross-sectional top view of a microwave heating apparatus according to a still other embodiment of the present invention.
  • Fig.8 is a cross-sectional front view of a microwave heating apparatus according to a still other embodiment of the present invention.
  • Fig.9 is a cross-sectional front view of a prior art microwave heating apparatus.
  • Fig.10 is a cross- sectional view showing a key part of the microwave heating apparatus of Fig.9.
  • Fig.ll is a perspective view showing the key part of microwave heating apparatus of Fig.9.
  • Fig.l is a cross-sectional front view of a microwave heating apparatus according to a first embodiment of the present invention.
  • numeral 1 denotes an object of heating such as foodstuff
  • 2 is a heating cavity for housing heating object 1.
  • Heating object 1 is placed on a tray 5 which is on a metal turntable 4 driven by a motor provided within an weight sensor 3 disposed outside the heating cavity 2 at the bottom centre.
  • Numeral 6 denotes a magnetron which generates microwave for heating a heating object 1
  • 7 is a wave guide for guiding the microwave to heating cavity 2
  • 8 is an opening for taking the microwave into heating cavity 2
  • 9 is a metal plate of flat shape.
  • Said magnetron 6 is mounted on the top of wave guide 7 with the antenna 10 for irradiating microwave facing the bottom surface of wave guide 7.
  • the bottom surface of wave guide 7 is disposed aslant towards the bottom of said opening 8, and said metal plate 9 is disposed in parallel with the slanted bottom surface of wave guide 7.
  • the metal plate 9 is made with an aluminum material of low electric-resistivity in order to obtain a reduced heat generating loss due to microwave, formed in a rectangular shape for matching with the cross-sectional shape, rectangle, of wave guide 7 (Fig.2) so as to obtain highest possible effects in regulating the direction of microwave.
  • the opening 8 is divided into a lower opening formed by the bottom surface of wave guide 7 and metal plate 9 and an upper opening formed by the ceiling surface of wave guide 7 and metal plate 9.
  • Microwaves irradiated vertically from antenna 10 of magnetron 6 with a certain spread angle reach the bottom surface of wave guide 7 and travel along the down slope.
  • the metal plate 9 disposed in parallel with the bottom surface of wave guide most of the microwaves arrive at opening 8 without dispersion, and then start spreading after the opening 8.
  • the distance before arriving at heating object 1 is shorter and the percentage of microwaves reaching direct to heating object 1 goes higher.
  • the microwave irradiation may be directed towards the bottom centre of heating object 1.
  • a second embodiment is described hereunder referring to Figs.2 through 4.
  • the basic structure of second embodiment remains the same as that of the first embodiment.
  • Those represented with the same symbols as in the first embodiment have the same structures, and description of which is omitted here.
  • the point of difference as compared with the first embodiment is that the present embodiment comprises a motor 11 for revolving the metal plate 9 disposed within wave guide 7.
  • the metal plate 9 within said wave guide 7 may be switched to either a state in which it is positioned in parallel with the bottom surface of wave guide 7 or to a state in which it is positioned perpendicular to the bottom of heating cavity 2, according to detection results(information about foodstuff) 14 obtained from weight sensor 3 for detecting weight of heating object 1 or by the selection of a cooking menu key(hereinafter simply referred to as menu) 12.
  • menu key 12 suitable to a foodstuff, or heating object 1
  • a cooking start key 13 is pressed.
  • Magnetron 6 starts irradiating microwaves.
  • Metal turntable 4 as well as tray 5 are revolved by the motor of weight sensor 3, and heating object 1 revolves and the weight is measured.
  • the metal plate 9 disposed within wave guide 7 for regulating the direction of microwave irradiation is revolved by motor 11.
  • Numeral 15 denotes a control circuit for controlling the motor 11 in accordance with the information about cooking.
  • charts (a) through (c) illustrate cross-sectional views of wave guide as well as conceptual distribution patterns of electric fields at the opening 8 as viewed from heating cavity 2, corresponding to respective positioning angles of metal plate 9.
  • Fig.4(a) shows a distribution pattern when metal plate 9 is positioned in parallel with the inclined bottom surface of wave guide 7, whereas Fig.4(c) shows that when metal plate 9 is perpendicular to the bottom of heating cavity 2; Fig.4(b) represents a state in between.
  • Fig.5 shows the result of cooking when a cup of milk and a frozen shao-mai.
  • Fig.5(a) represents a relationship between the positioning of metal plate 9 and the temperature difference in the heating objects
  • Fig.5(b) represents a relationship between the positioning of metal plate 9 and the heating time.
  • Fig.5 teaches us that when metal plate 9 is positioned in parallel with the bottom surface of wave guide 7 the heating time is shorter regarding both the milk and shao-mai, there are unfavourable temperature difference which is especially significant in shao-mai(unevenness of heating is significant in terms of a horizontal plane). On the other hand, when metal plate 9 is positioned perpendicular the temperature difference is small although a longer heating time is needed. It is understood from the above results that the microwaves are concentrated to the centre when metal plate 9 is positioned in parallel with the bottom surface of wave guide 7, while the microwaves are widely scattered when metal plate 9 is positioned perpendicular.
  • one heating pattern may be selected from two patterns according to category specified by selection of a menu key 12 and to the large or small of quantity value of heating object 1 obtained from weight sensor 3, cooking is conducted at a high efficiency with a suppressed unevenness of temperature.
  • the third embodiment comprises a motor 11 for revolving the metal plate 9 disposed within wave guide 7 and positioning of the metal plate 9 within said wave guide 7 is adjustable to any angle from the parallel to the bottom surface of wave guide 7 to the perpendicular to the bottom of heating cavity 2, according to detection results obtained from weight sensor 3 for detecting weight of heating object 1 or by the selection of cooking menu key 12.
  • Fig.4(a) shows a distribution pattern when metal plate 9 is positioned in parallel with the inclined bottom surface of wave guide 7, whereas Fig.4(c) shows that when metal plate 9 is perpendicular to the bottom of heating cavity 2; Fig.4(b) represents a state in between.
  • the angle of metal plate 9 is variable to any angle between a state where it is parallel to the inclined bottom surface of wave guide 7 and a state where it is perpendicular to the bottom of heating cavity 2, therefore the ratio of microwaves between those from an opening 8a formed by the bottom surface of wave guide 7 and metal plate 9 and those from an opening 8b formed by the ceiling surface of wave guide 7 and metal plate 9 is adjustable. This enables to conduct an even heating that is suitable to a foodstuff, heating object 1.
  • a fourth embodiment is described hereunder referring to Figs.2 through 4 and Fig.6. Those components having the same structure as the third embodiment are represented with the same symbols, and explanation of which is omitted.
  • the speciality with the fourth embodiment is that it comprises a stirrer 16 on one of the inner wall surfaces of heating cavity 2 other than that having opening 8. The operation and the function are described in the following. After a menu key 12 suitable to a foodstuff is selected, a cooking start key 13 is pressed. Magnetron 6 starts irradiating microwaves. Metal turntable 4 as well as tray 5 are revolved by the motor of weight sensor 3, and heating object 1 revolves and the weight is measured.
  • the metal plate 9 disposed within wave guide 7 for regulating the direction of microwave irradiation is revolved by motor 11.
  • a stirrer 16 provided on an inner wall surface of heating cavity 2 is driven by a stirrer motor 17 in order to stir the microwaves.
  • the effectiveness of microwave stirring for thawing is already known.
  • the stirring effect is expected on the reflected microwaves irradiated from opening 8b, among those microwaves splitted for irradiation from opening 8a formed by the bottom surface of wave guide 7 and metal plate 9 and those from opening 8b formed by the ceiling surface of wave guide 7 and metal plate 9.
  • a fifth embodiment is described hereunder referring to Fig.l, Fig.2, Fig.3 and Fig.7. Those components having same structure as the fourth embodiment are represented with the same symbols, and explanation of which is omitted here.
  • a protrusion of conical shape 18 towards outside of heating cavity haying a spherical protrusion 19 towards inside at the centre is provided on at least one of the inner wall surfaces of heating cavity other than that having opening.
  • a cooking start key 13 is pressed.
  • Magnetron 6 starts irradiating microwaves.
  • Metal turntable 4 as well as tray 5 are revolved by the motor of weight sensor 3, and heating object 1 revolves and the weight is measured.
  • the metal plate 9 disposed within wave guide 7 for regulating the direction of microwave irradiation is revolved by motor 11.
  • the centrally-concentrated pattern of electric fields which is produced when metal plate 9 is positioned parallel to the bottom surface of wave guide 7 is suitable to warm up milk, boiled rice, etc.
  • the widely-dispersed pattern of electric fields which is produced when metal plate 9 is positioned perpendicular is suitable for thawing frozen foods, etc.
  • the microwaves from opening 8a are absorbed direct into heating object 1, while those from opening 8b are absorbed into heating object 1 after being reflected by inner wall surfaces of heating cavity 2.
  • some of microwaves hitting the conical outward protrusion are splitted into those immediately reflected and those concentrated to the centre, depending on an angle of incidence. Those microwaves concentrated to the centre are reflected dispersed by the inward spherical protrusion towards tray 5.
  • Fig.8 is a cross-sectional front view of a microwave heating apparatus according to a sixth embodiment of the present invention.
  • the point of difference as compared with the first embodiment is that in the sixth embodiment there are pluralities of metal plates 9 for regulating the direction of microwave irradiation provided at an equal clearance on a vertical direction of the metal plate, these metal plates being revolvable at an equal clearance.
  • the present embodiment makes all the microwaves from magnetron 6 travel towards the heating object 1, to a further improved heating efficiency.
  • the plural metal plates disposed with an equal clearance are effective in turning the microwaves into plane waves for a narrow directivity; and as a result the gain is increased.
  • a magnetron is mounted on the top surface of wave guide, the bottom surface of said wave guide is inclined towards the bottom of said opening, a metal plate is disposed in parallel with the bottom surface of wave guide.
  • the angle of metal plate inside the wave guide with respect to the bottom surface of wave guide is variable according to detection results obtained from a weight sensor for detecting weight of a heating object or by the selection of a menu key
  • the ratio of microwaves to be irradiated from an opening formed by the bottom surface of wave guide and the metal plate versus those to be irradiated from an opening formed by the ceiling surface of wave guide and the metal plate is variable. Therefore, the cooking capability may be improved by optimizing the angle of metal plate to be most suitable for a foodstuff, or a heating object, according to the identification of heating object by selection of a cooking menu and the value of quantity obtained from the weight sensor.
  • a stirrer for stirring the microwaves provided on an inner wall surface of heating cavity other than that having the opening contributes stirring reflected microwaves from splitted openings, that formed by the bottom surface of wave guide and metal plate and that formed by the ceiling surface of wave guide and metal plate; therefore, unevenness of heating is improved also during thawing of frozen foodstuff where the allowable temperature range is narrow.
  • an outward conical protrusion having inward spherical protrusion at the centre provided on an inner wall surface of heating cavity collects from heating cavity 2 the microwaves irradiated from the opening 8b to the centre, and the spherical protrusion at the centre reflects them with a dispersion for irradiating the heating object 1; therefore, the unevenness of heating is improved also during thawing of frozen foodstuff where the allowable temperature range is narrow.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Electric Ovens (AREA)

Abstract

Cette invention concerne un appareil de chauffage à micro-ondes, lequel permet de chauffer des aliments de manière régulière et avec une grande efficacité. Cet appareil comprend un magnétron (6) monté sur la surface supérieure d'un guide d'ondes (7). La surface inférieure de ce guide d'ondes (7) est inclinée vers le fond d'une ouverture, tandis qu'une plaque métallique (9) est disposée à une certaine distance au-dessus de ladite surface inférieure du guide d'ondes (7). Les micro-ondes générées par l'antenne (10) du magnétron (6) se déplacent le long de la surface inférieure du guide d'ondes (7), et sont guidées vers l'ouverture (8) tout en étant régulées par la plaque métallique (9). Ce système permet de supprimer la dispersion des micro-ondes qui atteignent l'ouverture sans subir de perte d'énergie. Un objet à chauffer (1) est ainsi directement soumis au rayonnement des micro-ondes, ce qui permet d'améliorer l'efficacité du chauffage.
PCT/JP1997/001822 1996-06-03 1997-05-29 Appareil de chauffage a micro-ondes WO1997047161A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US09/194,739 US6114677A (en) 1996-06-03 1997-05-29 Microwave heating apparatus having a metal plate rotatably disposed in a wave guide

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP8139884A JPH09320756A (ja) 1996-06-03 1996-06-03 高周波加熱装置
JP8/139884 1996-06-03
JP9/13630 1997-01-28
JP01363097A JP3855337B2 (ja) 1997-01-28 1997-01-28 高周波加熱装置

Publications (2)

Publication Number Publication Date
WO1997047161A2 true WO1997047161A2 (fr) 1997-12-11
WO1997047161A3 WO1997047161A3 (fr) 1998-02-05

Family

ID=26349448

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1997/001822 WO1997047161A2 (fr) 1996-06-03 1997-05-29 Appareil de chauffage a micro-ondes

Country Status (2)

Country Link
US (1) US6114677A (fr)
WO (1) WO1997047161A2 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6469286B1 (en) * 1997-11-13 2002-10-22 Matsushita Electric Industrial Co., Ltd. Variable-impedance unit, microwave device using the unit, and microwave heater
DE10343708A1 (de) * 2003-09-18 2005-05-12 Nexpress Solutions Llc Verfahren für das Befestigen von Toner an einem Bedruckstoff und Mikrowelleneinrichtung
US10674570B2 (en) 2006-02-21 2020-06-02 Goji Limited System and method for applying electromagnetic energy
US8653482B2 (en) 2006-02-21 2014-02-18 Goji Limited RF controlled freezing
WO2007096877A2 (fr) * 2006-02-21 2007-08-30 Rf Dynamics Ltd. Chauffage électromagnétique
US8839527B2 (en) 2006-02-21 2014-09-23 Goji Limited Drying apparatus and methods and accessories for use therewith
EP2127481A1 (fr) 2007-02-21 2009-12-02 RF Dynamics Ltd. Congélation commandée par rf
US7515859B2 (en) * 2007-04-24 2009-04-07 Eastman Kodak Company Power splitter for a microwave fuser of a reproduction apparatus
IL184672A (en) 2007-07-17 2012-10-31 Eran Ben-Shmuel Apparatus and method for concentrating electromagnetic energy on a remotely-located object
US9131543B2 (en) 2007-08-30 2015-09-08 Goji Limited Dynamic impedance matching in RF resonator cavity
EP2356879B1 (fr) 2008-11-10 2012-10-17 Goji Limited Dispositif et procédé permettant de contrôler l'énergie
KR101584397B1 (ko) 2009-11-10 2016-01-11 고지 엘티디. Ｒｆ 에너지를 사용하여 가열하기 위한 장치 및 방법
EP2446706B1 (fr) 2010-05-03 2016-01-27 Goji Limited Analyse modale

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5272953A (en) * 1975-12-15 1977-06-18 Matsushita Electric Ind Co Ltd Heating equipment used micro wave
US4185182A (en) * 1978-07-03 1980-01-22 Armstrong Cork Company Microwave oven apparatus
DE3703133A1 (de) * 1987-02-03 1988-08-11 Buderus Kuechentechnik Verfahren und vorrichtung zur vergleichmaessigung der erwaermung von speisen in einem mit mikrowellenenergie beheizten gargeraet
KR900003489B1 (ko) * 1987-03-14 1990-05-19 삼성전자 주식회사 전자레인지의 고주파 분산 장치
JPS63254321A (ja) * 1987-04-10 1988-10-21 Matsushita Electric Ind Co Ltd 高周波加熱装置
JPS63294685A (ja) * 1987-05-27 1988-12-01 Hitachi Ltd マイクロ波加熱装置
CA2087638C (fr) * 1992-01-23 1997-02-25 Masatugu Fukui Four a micro-ondes a adaptation d'impedance
KR950003782B1 (ko) * 1992-08-25 1995-04-18 주식회사금성사 투 웨이(Two Way) 가열방식의 전자레인지
JP2627730B2 (ja) * 1993-09-23 1997-07-09 エルジー電子株式会社 電子レンジの自動整合装置

Also Published As

Publication number Publication date
US6114677A (en) 2000-09-05
WO1997047161A3 (fr) 1998-02-05

Similar Documents

Publication Publication Date Title
US4354083A (en) Microwave oven with novel energy distribution arrangement
CA1197565A (fr) Four a micro-ondes avec systeme d'excitation a double alimentation
US4464554A (en) Dynamic bottom feed for microwave ovens
US4596915A (en) Microwave oven having resonant antenna
WO1997047161A2 (fr) Appareil de chauffage a micro-ondes
CA1166703A (fr) Systeme d'excitation pour four a micro-ondes utilisant un faisceau polarise circulairement pour uniformiser la distribution d'energie et ameliorer l'adaptation d'impedance
US4335290A (en) Microwave oven blower radiator
US4176266A (en) Microwave heating apparatus
AU3105699A (en) Apparatus for supplying microwave energy to a cavity
US6469286B1 (en) Variable-impedance unit, microwave device using the unit, and microwave heater
CA1253577A (fr) Systeme circulateur d'air dans l'enceinte d'un four a micro-ondes
US4616119A (en) Uniformly heating apparatus for microwave ovens
CA1193326A (fr) Four a microondes avec antenne rotative
US4546225A (en) Bearing support for microwave oven antenna
JP4241861B2 (ja) マイクロ波加熱装置
JP3855337B2 (ja) 高周波加熱装置
JP2016118344A (ja) マイクロ波加熱装置
JP4241860B2 (ja) マイクロ波加熱装置
JPH0917569A (ja) マイクロ波食品解凍加熱装置及び食品自動販売機
CA1177899A (fr) Four a micro-onde avec distribution uniforme de l'energie statique
JPH09320756A (ja) 高周波加熱装置
JP3819618B2 (ja) 高周波加熱装置
JPS6359234B2 (fr)
JP4126794B2 (ja) 高周波加熱装置
JP3246095B2 (ja) 高周波加熱装置

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): CA CN KR SG US

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

AK Designated states

Kind code of ref document: A3

Designated state(s): CA CN KR SG US

AL Designated countries for regional patents

Kind code of ref document: A3

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 09194739

Country of ref document: US

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载